Merge pull request #8 from davidw/master

Add sys/resource.h include to fix the Debian compilation issue
Added code to manage an already existing external process.
Merge branch 'master' of git://github.com/saleyn/erlexec into manage
Whitespace fixes - tab to spaces.
Accept options for manage command.
Merge pull request #10 from davidw/manage

Added code to manage an already existing external process.